They use the fake pop-up below:
https://d1baoae6v99f76.cloudfront.net/CHH9/?phone=+1-(855)-516-3058&uclick=bz37b43y&uclickhash=bz37b43y-bz37b43y-pm-0-pm-ft-9l-b53016#
which I mentioned in the other discussion specifically about that Fake Pop-Up generator, which will hopefully be removed by AWS soon (I'm in contact with them).